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Phonon Scattering and Internal Friction in Dielectric and Metallic Films at Low Temperatures

Autor: Vu, P. D., Liu, Xiao, Pohl, R. O.

We have measured the heat conduction between 0.05 K and 1.0 K of high purity silicon wafers carrying on their polished faces a variety of thin dielectric films and polycrystalline thin metallic films. Using a Monte Carlo simulation to analyze the con

Externí odkaz: http://arxiv.org/abs/cond-mat/0002413

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Low temperature acoustic properties of amorphous silica and the Tunneling Model

Autor: Thompson, EunJoo, Lawes, G., Parpia, J. M., Pohl, R. O.

Internal friction and speed of sound of a-SiO(2) was measured above 6 mK using a torsional oscillator at 90 kHz, controlling for thermal decoupling, non-linear effects, and clamping losses. Strain amplitudes e(A) = 10^{-8} mark the transition between

Externí odkaz: http://arxiv.org/abs/cond-mat/9912191

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Internal Friction of Amorphous Silicon in a Magnetic Field

Autor: Metcalf, T. H., Liu, Xiao, Pohl, R. O.

The internal friction of e-beam amorphous silicon was measured in a magnetic field between 0 and 6 T, from 1.5-20 K, and was found to be independent of the field to better than 8%. It is concluded that the low energy excitations observed in this expe

Externí odkaz: http://arxiv.org/abs/cond-mat/9911102

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